Intel® Integrated Performance Primitives Developer Guide and Reference

ID 790148
Date 11/07/2023
Public

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Document Table of Contents

TiltedSqrIntegral

Transforms an image to tilted integral and tilted integral of pixel squares representations.

Syntax

IppStatus ippiTiltedSqrIntegral_8u32s_C1R(const Ipp8u* pSrc, int srcStep, Ipp32s* pDst, int dstStep, Ipp32s* pSqr, int sqrStep, IppiSize roiSize, Ipp32s val, Ipp32s valSqr);

IppStatus ippiTiltedSqrIntegral_8u32s64f_C1R(const Ipp8u* pSrc, int srcStep, Ipp32s* pDst, int dstStep, Ipp64f* pSqr, int sqrStep, IppiSize roiSize, Ipp32s val, Ipp64f valSqr);

IppStatus ippiTiltedSqrIntegral_8u32f64f_C1R(const Ipp8u* pSrc, int srcStep, Ipp32f* pDst, int dstStep, Ipp64f* pSqr, int sqrStep, IppiSize roiSize, Ipp32f val, Ipp64f valSqr);

Include Files

ippcv.h

Domain Dependencies

Headers: ippcore.h, ippvm.h, ipps.h, ippi.h

Libraries: ippcore.lib, ippvm.lib, ipps.lib, ippi.lib

Parameters

pSrc

Pointer to the source image ROI.

srcStep

Distance in bytes between starts of consecutive lines in the source image.

pDst

Pointer to the ROI in the destination integral image.

dstStep

Distance in bytes between starts of consecutive lines in the destination image.

pSqr

Pointer to the ROI of the destination integral image of pixel squares.

sqrStep

Distance in bytes between starts of consecutive lines in the destination integral image of pixel squares.

roiSize

Size of source image ROI in pixels.

val

The value to add to pDst image pixels.

valSqr

The value to add to pSqr image pixels

Description

This function operates with ROI (see Regions of Interest in Intel IPP). This function builds two destination image: tilted integral image pDst and tilted integral image of pixel squares pSqr.

Pixel values of pDst are computed using pixel values of the source image pSrc and the specified value val in accordance with the following formula:


Pixel values of pSqr are computed using pixel values of the source image pSrc and the specified value valSqr in accordance with the following formula:


where i,j are coordinates of the destination image pixels (see Figure “Operation of the Integral and TiltedIntegral functions”) varying in the range i = 2 ,..., roiSize.height, j = 0,..., roiSize.width. Pixel values of zero and first rows (i=0,1) are set to val for pDst, and to valSqr for pSqr. The size of both destination images is (roiSize.width + 2) x (roiSize.height + 2).

Figure “Operation of the Integral and TiltedIntegral functions” shows what pixels (red circles) of the source image are used in computation new pixel values in the i,j coordinates.

Return Values

ippStsNoEr

Indicates no error.

ippStsNullPtrErr

Indicates an error if one of the specified pointers is NULL.

ippStsSizeErr

Indicates an error condition if roiSize has a field with zero or negative value.

ippStsStepErr

Indicates an error condition if srcStep is less than roiSize.width * <pixelSize>, or dstStep or sqrStep is less than (roiSize.width+2) * <pixelSize> .

ippStsNotEvenStepErr

Indicates an error condition if dstStep is not divisible by 4, or sqrStep is not divisible by 8.